removed empty aliases from doc string

lib/ansible/modules/extras/cloud/centurylink/clc_alert_policy.py

@@ -35,19 +35,17 @@ options:
       - The name of the alert policy. This is mutually exclusive with id
     required: False
     default: None
-    aliases: []
   id:
     description:
       - The alert policy id. This is mutually exclusive with name
     required: False
     default: None
-    aliases: []
   alert_recipients:
     description:
       - A list of recipient email ids to notify the alert.
         This is required for state 'present'
     required: False
-    aliases: []
+    default: None
   metric:
     description:
       - The metric on which to measure the condition that will trigger the alert.
@@ -55,14 +53,12 @@ options:
     required: False
     default: None
     choices: ['cpu','memory','disk']
-    aliases: []
   duration:
     description:
       - The length of time in minutes that the condition must exceed the threshold.
         This is required for state 'present'
     required: False
     default: None
-    aliases: []
   threshold:
     description:
       - The threshold that will trigger the alert when the metric equals or exceeds it.
@@ -70,7 +66,6 @@ options:
         This number represents a percentage and must be a value between 5.0 - 95.0 that is a multiple of 5.0
     required: False
     default: None
-    aliases: []
   state:
     description:
       - Whether to create or delete the policy.